Can Brands Ultimate bounce off of towers?

So i was playing annie in mid, no big deal. I was fighting a brand and to my surprise he flashed under my turret while dropping all his spells on me. I didn't die, then i see the ultimate coming in and I eat a potion and use my E blocking most of the damage (Thank god for rank 3 E on annie). However then i noticed it bounce off my tower and right back at me killing me. I was wondering if this was a bug, if anyone else had seen it, and if someone could explain to me maybe what happened? Thank you ^_^